Biomass pellet stove

ABSTRACT

A stove using biomass pellets as fuels includes a stove body, wherein the stove body comprises a firebox; hopper, wherein the hopper is fixed above the stove body; and feed tube, wherein the top end of the feed tube which is connected to the hopper is fixed outside the stove body, the bottom end of the feed tube which is connected to the firebox crosses the stove body. The stove using biomass pellets as fuels solves the problem that common pellet stoves usually transfer the fuels to the hearth using a screw feeder or other feeding equipment, which expend too much cost.

FOREIGN PRIORITY DATA

This application claims priority from and the benefit of China patent application CN 201710382267.5, filed May 26, 2017, the entire disclosure of which is hereby by incorporated by reference herein.

TECHNICAL FIELD

The present disclosure relates to the technical field of a pellet stove, and particularly to a pellet stove that uses biomass pellets as fuels.

BACKGROUND

Pellet stoves that use biomass pellets as fuels can have a large size and heavy weight, may be inconvenient for mobile use after installing, and are usually suitable for indoor use of heating. In addition, they often have complex designs and high manufacturing cost, and may include many electrical components, such as an auger system or other feeding apparatus to feed biomass pellets to a firebox, which limits reliability and raise costs of use and maintenance.

The common pellet stoves usually transfer the fuels to the hearth using screw feeder or other feeding equipment, which expend too much cost. In addition, in the using of the common pellet stoves there are several other problems: for example, the inlet air of traditional furnace is fixed at the side of the furnace, which results in poor burning effect; the insulation of the feed pipe is poor, which results in the temperature of the feed pipe being too high; a feed tube of biomass pellet feed rate is difficult to adjust; and carbide slag is easy to jam after combustion grate, cause breath goes out.

SUMMARY

First, in order to solve the problem that the common pellet stoves usually transfer the fuels to the hearth using screw feeder or other feeding equipment, which expends too much costs, an embodiment of the disclosure includes a stove, using biomass pellets as fuels, comprising a stove body, wherein the stove body comprises a firebox; a hopper, wherein the hopper is fixed above the stove body; and a feed tube, wherein the top end of the feed tube which is connected to the hopper is fixed outside the stove body, the bottom end of the feed tube which is connected to the firebox crosses the stove body.

In order to solve the problem that the inlet air of traditional furnace is fixed at the side of the furnace, which results in poor burning effect, in accordance with an embodiment of the disclosure, inlet air is ran through the bottom of stove body, and an inlet air device is fixed at the inlet air.

In order to adjust the supply air rate, wherein the inlet air device is an inlet air plate, several holes symmetrically distributed along the center of the same circle are ran through the air plate, several block sheets which cover the said holes one-to-one are fixed below the air plate, and all the block sheets, which are connected with driving lever, connect together.

In order to solve the problem that the feeding rate of the fuels is hard to adjust, an embodiment of the disclosure further comprises a feeding control device which comprises a feeding block and handle, the feeding block crosses an end of the feed tube which is close to the stove body, the handle which is connected with the feeding block is fixed on an end of the feed tube, which is away from the said stove body.

The functions of the handle are as follows: when in trendy, row open, blanking, pushed to the bottom is opened entirely. Pull outward, gradually closed gear row, until all pull out, then the flame will die out. Because the handle is just pull out all position, just can be conducive to handling the stove.

In an embodiment, a flue is fixed at the top of the firebox, and a fire grate which is connected with the stove body is fixed at the bottom of the firebox.

In order to avoid residue influent feeding and air flowing, an embodiment comprises a double-edged fine-toothed comb fixed at the bottom of the fire grate, which are slidingly joined to each other, and a driving lever fixed at the said double-edged fine-toothed comb.

In an embodiment, an oven which packs the flue is fixed at the middle part of the hopper, and a baked bar is fixed at the bottom of the oven.

In an embodiment, a slag collection box is fixed below the fire grate.

In order to achieve better burning effects, an embodiment comprises a feed tube comprising a vertical tube and a inclined pipe, which are connected to each other, the vertical tube fixed outside of the said stove body, an end of the inclined pipe connected with the bottom of the vertical tube, the other end of the inclined pipe stretching into the firebox.

In order to achieve better burning effects, an embodiment comprises the distance between the bottom of the inclined pipe and the fire grate being in a range of 20 millimeters to 22 millimeters; the included angle between the vertical tube and the inclined pipe is in a range of 134° to 135°.

In order to achieve better insulation effects, an embodiment comprises a thermal baffle which is fixed at the lateral wall of the stove body, a heat-sink wind tunnel formed between the feed tube and the thermal baffle, which both are located outside the stove body, and several heat-sink holes which are connected with the heat-sink wind tunnel are put through the thermal baffle.

In order to achieve better burning, in an embodiment, an air-vent connected with the firebox is put through the sidewall of the stove body.

In an embodiment, a feed tube is set for a couple, which are distributed in the two sides of the said stove body one-to-one; the air-vent is set for a couple, which are symmetrically distributed along the vertical section which passed through the axle wire between the two feed tubes; the stove further comprising two cambered dampers which are fixed in the firebox, the two cambered dampers are symmetrically distributed along the vertical section which pass through the axle wire between the two feed tubes, and there is a gap between the top end of the cambered dampers and the top end of the firebox, the bottom of the cambered dampers is close to the above of the fire grate, the two side ends of the cambered dampers is connected with the inside wall of the stove body.

In an embodiment, an air vent is put through the end of the cambered dampers which is higher than the inclined pipe.

In an embodiment, a bending plate is formed by bending toward far away from the stove body is fixed at the top end and the bottom end of the cambered dampers.

In order to adjust the capacity of the hopper, in an embodiment, an overhead guard is fixed by slip connection with the inside wall of the hopper; the overhead guard is limited connected with the hopper by a limiting bolt.

In an embodiment, a furnace door with an inspection window is fixed at the front side of the stove body.

In an embodiment, a heat-sink chassis with several air holes is fixed at the bottom of the stove body; and a folding leg is fixed at the bottom of the heat-sink chassis.

In an embodiment, a guard bar surrounds and is fixed at the sidewall of the stove body.

In an embodiment, a water tank is fixed at the backside of the stove body.

The above technical solutions have the below features:

1. The stove has a simple structure and removes any mechanically or electrically controlled feeding system by feeding the firebox using gravity of the fuels, therefore lowering the cost.

2. Setting cambered dampers forces air along the arc baffle to above, from the burning of flue gas, thus blowing flue gas particle sedimentation to below; and forces air along the arc baffle to below, which from the direction of biomass particles on the plenum, improves the effect of the biomass particles combustion at the same time, by going into the air inlets at the bottom of the furnace body drive after joining the air arc baffle to below, and then to the above movement, and with the arc-shaped baffle to the above the conveying air convection, so as to further promote the separation of particles in flue gas.

3. Setting the vent on arc baffle makes the arc baffle the air through the vent above the conveyor, and smoke from the burning of blowing, and from the flue gas particles sedimentation to below. Setting the bending plate makes the air transfer as far as possible in a larger range.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is the motioned stereogram of the furnace of the invention;

FIG. 2 is the front view of the stove body;

FIG. 3 is the section view of FIG. 2;

FIG. 4 is the structure schematic diagram of hopper;

FIG. 5 is the state of the change of FIG. 4;

FIG. 6 is the structure schematic diagram of feed tube;

FIG. 7 is the change of FIG. 6 state;

FIG. 8 is the structure schematic diagram of the feeding block and handle;

FIG. 9 is the structure schematic stereogram of air plate;

FIG. 10 is the change of FIG. 9 state;

FIG. 11 is the stereogram of fire grate;

FIG. 12 is the change of FIG. 11 state;

FIG. 13 is the back view of the furnace;

FIG. 14 is the diagram of another furnace;

FIG. 15 is the diagram of cambered dampers in FIG. 14.

DETAILED DESCRIPTION Embodiment 1

Seen in FIG. 1-FIG. 12, a stove using biomass pellets as fuels, comprises: stove body 21, wherein the stove body 21 comprises a firebox 16; hopper 12, wherein the hopper 12 is fixed above the stove body 21; and feed tube 10, wherein the top end of the feed tube 10 which is connected to the hopper 12 is fixed outside the stove body 21, the bottom end of the feed tube 10 which is connected to the firebox 16 crosses the stove body 21; inlet air is ran through the bottom of stove body 21, and an inlet air device is fixed at the inlet air.

In order to adjust the supply air rate, wherein the inlet air device is inlet air plate 24, several or a plurality of holes 30 symmetrically distributed along the center of the same circle are ran through the said air plate 24, several block sheets 31 which cover the holes 30 one-to-one are fixed below the said air plate 24, and all the said block sheets 31 which are connected with driving lever 7 connect together.

In order to solve the problem that the feeding rate of the fuels is hard to adjust, an embodiment further comprises a feeding control device which comprises feeding block 23 and handle 11, the feeding block 23 crosses an end of the feed tube 10, which is close to the stove body 21, the handle 11, which is connected with the feeding block 23 is fixed on an end of the feed tube 10, which is away from the said stove body 21.

In an embodiment, a flue 15 is fixed at the top of the said firebox 16, a fire grate 17 which is connected with the stove body 21 is fixed at the bottom of the firebox 16.

In order to avoid that residue influent feeding and air flowing, in an embodiment, a double-edged fine-toothed comb 25 is fixed at the bottom of the fire grate 17, which are slidingly joined to each other, and a driving lever 2 is fixed at the double-edged fine-toothed comb 25.

In an embodiment, an oven 14 that packs the flue 15 is fixed at the middle part of the hopper 12, and a baked bar is fixed at the bottom of the said oven 14.

In an embodiment, a slag collection box is fixed below the said fire grate 17.

In order to achieve better burning effects, in an embodiment, the feed tube 10 comprises a vertical tube 28 and an inclined pipe 29 which are connected to each other, the vertical tube 28 is fixed outside of the stove body 21, an end of the inclined pipe 29 is connected with the bottom of the vertical tube 28, the other end of the said inclined pipe 29 stretches into the firebox 16.

In order to achieve better burning effects, in an embodiment, the distance between the bottom of the inclined pipe 29 and the fire grate 17 is in a range of 20 mm to 22 mm; and the included angle between the vertical tube 28 and the inclined pipe 29 is in a range of 134°-135°.

In order to achieve better insulation effects, an embodiment comprises a thermal baffle 20 fixed at the lateral wall of the stove body 21, a heat-sink wind tunnel 22 is formed between the feed tube 10 and the thermal baffle 20, which both are located outside the stove body 21, several heat-sink holes 1 connected with the heat-sink wind tunnel 22 are put through the thermal baffle 20.

In order to achieve better burning, in an embodiment, an air-vent 26 connected with the firebox 16 is put through the sidewall of the stove body 21.

In order to adjust a capacity of the hopper, an overhead guard 18 is fixed by slip connection with the inside wall of the said hopper 12; the overhead guard 18 is limited connected with the hopper 12 by a limiting bolt 19.

In an embodiment, a furnace door with an inspection window is fixed at the front side of the stove body 21.

In an embodiment, a heat-sink chassis 5 with several air holes is fixed at the bottom of the stove body 21; a folding leg 6 is fixed at the bottom of the heat-sink chassis 5.

In an embodiment, a guard bar 35 surrounds and is fixed at the sidewall of the stove body 21.

In an embodiment, a water tank is fixed at the backside of the stove body 21.

Embodiment 2

Compared with embodiment 1, embodiment 2 has the following improvement: the said feed tube 10 is set for a couple, which are distributed in the two sides of the stove body 21 one-to-one; the air-vent 26 is set for a couple, which are symmetrically distributed along the vertical section which is passed through the axle wire between the two feed tubes 10; the stove further comprising two cambered dampers 32 which are fixed in the firebox 16, the two cambered dampers 32 are symmetrically distributed along the vertical section which is passed through the axle wire between the two feed tubes 10, and there is a gap between the top end of the cambered dampers 32 and the top end of the firebox 16, the bottom of the cambered dampers 32 is close to the above of the fire grate 17, the two side ends of the cambered dampers 32 are connected with the inside wall of the said stove body 21.

Setting cambered dampers makes one way of the air along the arc baffle to above, from the burning of flue gas, thus blowing smoke and flue gas particles sedimentation to below; and another way of the air along the arc baffle to below, which from the direction of biomass particles on the plenum, improve the effect of the biomass particles combustion at the same time, by going into the air inlets at the bottom of the furnace body drive after joins the air arc baffle to below, and then to the above movement, and with the arc-shaped baffle to the above the conveying air convection, so as to further promote the separation of particles in flue gas.

In an embodiment, an air vent 33 is put through an end of the cambered dampers 32 which is higher than the inclined pipe 29.

In an embodiment, a bending plate 34 formed by bending toward far away from the stove body 21 is fixed at the top end and the bottom end of the cambered dampers 32.

Setting the vent on arc baffle makes the arc baffle the air through the vent above the conveyor, and smoke from the burning of blowing and from the flue gas particles sedimentation to below. Setting the bending plate makes the air transfer as far as possible in a larger range. 

1. A stove, using biomass pellets as fuels, comprising: a stove body, wherein the stove body comprises a firebox; a hopper, wherein the hopper is fixed above the stove body; and a feed tube, wherein a top end of the feed tube which is connected to the hopper is fixed outside the stove body, and a bottom end of the feed tube which is connected to the firebox crosses the stove body.
 2. The stove of claim 1, wherein inlet air is ran through the bottom of stove body, and an inlet air device is fixed at the inlet air.
 3. The stove of claim 2, the inlet air device further comprising: an inlet air plate; a plurality of holes symmetrically distributed along the center of a same circle are ran through the air plate; a plurality of block sheets which cover the plurality of holes one-to-one are fixed below the air plate, and all the block sheets, which are connected with a driving lever, connect together.
 4. The stove of claim 1, further comprising: a feeding control device comprising a feeding block and a handle, wherein the feeding block crosses an end of the feed tube which is close to the stove body, the handle which is connected with the feeding block is fixed on an end of the feed tube, which is away from the stove body.
 5. The stove of claim 1, comprising: a flue fixed at a top of the firebox; and a fire grate connected with the stove body and fixed at the bottom of the firebox.
 6. The stove of claim 5, comprising: a double-edged fine-toothed comb fixed at a bottom of the fire grate which are slidingly joined to each other; and a driving lever fixed at the double-edged fine-toothed comb.
 7. The stove of claim 5, comprising an oven which packs the flue fixed at the middle part of the hopper, and a baked bar fixed at the bottom of the oven.
 8. The stove of claim 5, further comprising a slag collection box fixed below the fire grate.
 9. The stove of claim 5, the feed tube further comprising: a vertical tube; and an inclined pipe connected to the vertical tube, the vertical tube fixed outside the stove body, an end of the inclined pipe connected with the bottom of the vertical tube, the other end of the said inclined pipe stretching into the firebox.
 10. The stove of claim 9, wherein a distance between the bottom of the inclined pipe and the fire grate is in a range of 20 mm to 22 mm; and an included angle between the vertical tube and the inclined pipe is in a range of 134° to 135°.
 11. The stove of claim 9, comprising: a thermal baffle which is fixed at a lateral wall of the stove body; a heat-sink wind tunnel formed between the feed tube and the thermal baffle, both located outside the stove body; and a plurality of heat-sink holes connected with the heat-sink wind tunnel and put through the said thermal baffle.
 12. The stove of claim 11, comprising: an air-vent connected with the firebox and put through a sidewall of the stove body.
 13. The stove of claim 11, wherein the feed tube is one of a pair of feed tubes, which are distributed in two sides of the stove body one-to-one; the air-vent is one of a pair of air-vents, which are symmetrically distributed along a vertical section passed through the axle wire between the two feed tubes; the stove further comprising two cambered dampers which are fixed in the firebox, the two cambered dampers symmetrically distributed along the vertical section passed through the axle wire between the two feed tubes; a gap between the top end of the cambered dampers and the top of the firebox, a bottom of said cambered dampers close to the above of the fire grate, two side ends of the cambered dampers connected with the inside wall of the stove body.
 14. The stove of claim 13, wherein an air vent is put through the end of the cambered damper which is higher than the said inclined pipe.
 15. The stove of claim 13, comprising a bending plate, formed by bending toward far away from the stove body, fixed at the top end and the bottom end of the said cambered dampers.
 16. The stove of claim 1, comprising an overhead guard fixed by a slip connection with the inside wall of the hopper; the overhead guard limited connected with the hopper by a limiting bolt.
 17. The stove of claim 1, comprising a furnace door with an inspection window fixed at a front side of the stove body.
 18. The stove of claim 1, comprising a heat-sink chassis defining a plurality of air holes fixed at the bottom of the stove body; and a folding leg fixed at the bottom of the heat-sink chassis.
 19. The stove of claim 1, comprising a guard bar fixed at the sidewall of the stove body.
 20. The stove of claim 1, comprising a water tank fixed at the backside of the stove body. 